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DOI10.1016/j.chemgeo.2003.07.002
Helium isotope studies in the Mojave Desert, California: implications for groundwater chronology and regional seismicity
Kulongoski, JT; Hilton, DR; Izbicki, JA
通讯作者Kulongoski, JT
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
EISSN1872-6836
出版年2003
卷号202期号:1-2页码:95-113
英文摘要

We report helium isotope and concentration results for groundwaters from the western Mojave River Basin (MRB), 130 km east of Los Angeles, CA. The basin lies adjacent to the NW-SE trending San Andreas Fault (SAF) system. Samples were collected along two groundwater flowpaths that originate in the San Gabriel Mountains and discharge to the Mojave River located similar to 32 km to the northeast. Additional groundwater samples were collected from Mojave River Deposits underlying the Mojave River. The primary objective of this study is to identify and quantify crustal and mantle helium contributions to the regional groundwater system.


A total of 27 groundwaters, sampled previously for chemistry and isotope systematics (including C-14 activity) have measured helium concentrations that increase along flowpaths from 9.9 x 10(-8) to 1.0 x 10(-4) cm(3) STP g(-1) H2O. Concomitantly, He-3/He-4 ratios decrease from 0.84R(A) to 0.11R(A) (R-A equals the He-3/He-4 ratio in air = 1.4 x 10(-6)). We did not record He-3/He-4 ratios equivalent to crustal-production values (similar to 0.02R(A)) in any sample.


Dissolved helium concentrations were resolved into components associated with solubility equilibration, air entraimnent, mantle-derivation, in-situ production within the aquifer, and extraneous crustal fluxes. All samples contained the first four components, but only older samples had the superimposed effects of helium derived from a crustal flux. The radiogenic He component has chronological significance, and good concordance between He-4 and C-14 ages for younger groundwaters (<25,000 year) demonstrates the integrity of the He-4-chronometer in this setting. Helium-rich waters could also be dated with the He-4 technique, but only by first isolating the whole crustal flux (3-10 x 10(-6) cm(3) STP cm(-2) year(-1)). Mantle-derived He-3 (He-3(m)) is present in all MRB samples irrespective of distance from the SAF. However, regional-aquifer groundwaters near the terminus of the flowpath have a significantly greater content of mantle-derived He-3 in comparison with more modem samples. We propose that faults in the basin other than the SAF may be an additional source of mantle-derived helium. The large range in He-3(m) concentrations may be related to fault activity; however, groundwaters with lower and more constant He-3(m) contents may indicate that seismic activity along the SAF has been relatively constant for the past 30,000 years, demonstrating that ancient groundwaters may serve as an archive for paleoseismic events. (C) 2003 Elsevier B.V. All rights reserved.


英文关键词helium isotope noble gas groundwater hydrology geochemistry
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000187365000007
WOS关键词GREAT ARTESIAN BASIN ; LONG VALLEY CALDERA ; NOBLE-GASES ; SOUTHEASTERN CALIFORNIA ; RADIOGENIC HELIUM ; WATER CIRCULATION ; NATURAL TRACERS ; PARIS BASIN ; TRANSPORT ; MOVEMENT
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/144314
作者单位(1)Univ Calif San Diego, Fluids & Volatiles Lab, Scripps Inst Oceanog, Geosci Res Div, La Jolla, CA 92093 USA;(2)US Geol Survey, Div Water Resources, San Diego, CA 92123 USA
推荐引用方式
GB/T 7714
Kulongoski, JT,Hilton, DR,Izbicki, JA. Helium isotope studies in the Mojave Desert, California: implications for groundwater chronology and regional seismicity[J]. United States Geological Survey,2003,202(1-2):95-113.
APA Kulongoski, JT,Hilton, DR,&Izbicki, JA.(2003).Helium isotope studies in the Mojave Desert, California: implications for groundwater chronology and regional seismicity.CHEMICAL GEOLOGY,202(1-2),95-113.
MLA Kulongoski, JT,et al."Helium isotope studies in the Mojave Desert, California: implications for groundwater chronology and regional seismicity".CHEMICAL GEOLOGY 202.1-2(2003):95-113.
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